Gas turbine control apparatus, gas turbine system and gas turbine control method

Abstract

A gas turbine control apparatus, etc. are provided by which combustion fluctuation, even if arising in plural frequency bands, can be effectively suppressed. If the combustion fluctuation arises in plural frequency bands, corresponding to a predetermined priority order, adjustment is done so that the combustion fluctuation of the frequency band of a high priority order is suppressed. If the gas turbine state changes after the adjustment, this is reflected on a data base 30. If no sufficient data is stored yet in the data base 30 for any the reason, such as immediately after installation of the gas turbine, correction is made using data of countermeasures based on data of another same type gas turbine contained in a basic data base 31 and data of countermeasures based on experiences of skilled adjusting operators contained in a knowledge data base 32. Also, in a stabilized operation, operation condition may be varied so that an optimal operation condition is automatically searched.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a gas turbine control apparatus by which combustion fluctuation is controlled to be suppressed and also relates to a gas turbine system using the gas turbine control apparatus and a gas turbine control method based on the same concept. [0003] 2. Description of the Prior Art [0004] In a prior art gas turbine, flow rates of air and fuel to be supplied into a combustor are decided in advance based on a generator output, atmospheric temperature and humidity, etc. and by using the values thereof, operation of the gas turbine is carried out. However, due to aged deterioration, such as deterioration of a compressor performance, clogging of a filter, or the like, there is a possibility that the actual flow rates of fuel and air deviate from planned values or adjusted values of the trial operation time. In this case, there is a possibility that the combustion stability is deteriorated or comb...

AI Technical Summary

Benefits of technology

[0014] In view of the technical problems as mentioned above, it is an object of the present invention to provide a gas turbine control apparatus, etc. by which combustion fluctuation can be effectively suppressed even if the combustion fluctuation arises in a plurality of frequency bands.

[0015] It is another object of the present invention to provide a gas turbine control apparatus, etc. by which an operation excellent in the stability, economy of operation and environment preservation performance can be carried out while the combustion fluctuation is being suppressed.

Problems solved by technology

However, due to aged deterioration, such as deterioration of a compressor performance, clogging of a filter, or the like, there is a possibility that the actual flow rates of fuel and air deviate from planned values or adjusted values of the trial operation time.

In this case, there is a possibility that the combustion stability is deteriorated or combustion fluctuation arises.

If combustion fluctuation arises, operation of the gas turbine may be largely obstructed.

Thus, in order to maintain the combustion stability and avoid the combustion fluctuation, adjustments of the control system are carried out several times a year by skilled operators so that the combustion stability is confirmed and maintained and this invites an increase of the maintenance cost and a deterioration of the availability.

If the fuel-air ratio is changed based on the combustion fluctuation of the low frequency band only, there may be a bad influence on the combustion fluctuation of other frequency bands.

In this way, by simply suppressing the combustion fluctuation only of the low frequency, it is difficult to effectively realize a stability of the combustion.

Moreover, such a state that a steady operation without the combustion fluctuation is carried out may not always be the best from the economical point of view, etc.

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